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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3471f2f2465c04a00e7174b5aa0286e830cead43e12db39f6e66d90fa1acc9bf' 
  AND token = 'O/ySaVm1DEhqXm/b1Iga9jS27kznx58W3KmjfszYK4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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