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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6f729b2d19403a1420bb0392b3ed226c1c16c32629cb2f063401e947229fdc0' 
  AND token = 'bA0BsOqbrw1w9zQ5U83a8qZM22Yot11MoJic22VyQtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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