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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a84e6ee4e7fc133543394c3f6fe1f00c5f112b0068bbc3eead21836a599e46' 
  AND token = 'zuOZgfm30F9/BLfrmRN2gEz6vB9Og5O288NLjmuxGTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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