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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b06a813cca0c8185711200d7bcdd1f9dbe9d26fe625ce14b8a63d7cbd31a4d' 
  AND token = 'HNOzG+Lo63Y5Lkfzts/oLTJoQ6rf8zpipkNQXXFDQas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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