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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a2c68b25e6ea24e9231f3016d6c60cac38c40ccc072049f93ae9065ae92f41' 
  AND token = 'npEkYjkEGnpQwdVI7343iU7yCS0KAdLPdBujy31Zptw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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