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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff40c8e4a6748912c8465df7aebed7884860293c73eef1459eeb39f49b7a219a' 
  AND token = 'nhIAtVt5DB+zD9cY+Gu1e3/2NoIFORge3Brm+pM/xak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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