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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd04a9b9fe4fc7adcd52c79202e2cd4f490d2a0bc836c418de06a3384dd05466a' 
  AND token = 'Y1DaU8RK0aOYCVdDWvYf55xUBOu6q3HXu/4sWSwQL48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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