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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c629de2d867a4cfc8f415f8e0b22673a3fcb5cbef3e65685c6869926d2825d1' 
  AND token = 'm/5cpZKmoii4cRyDaKzN7OP30UE9UKilSzTmFGy6ZPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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