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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b7680cc82bb497fa1c3d4d745d72bad008406892c0b20c3979f3e25d821f05' 
  AND token = 'OXtKw4U9nFUwf3xfdKlGYeTBaR6jlW/f28c6ty43rBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}