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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c14d4f9eedff1d982a9784a855cd3e2d150d5547db4476d3736a5daa9836066' 
  AND token = 'F+tjXxU11zazxkTqRu8AGIBzufNuqZPZcnrsWSjKAB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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