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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37ca86543c5a42841c7fc0f2cca2d371f37f83e7e96eafc3e7fb009551d7c4a8' 
  AND token = 'FG8z7Y/KauWk/9zQ9XqwSs8hsKhyLKzldHmSJ/xO35I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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