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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6362774da5c7a67087b38a8f610d5579aa05de13de007d62638b17e2ff2776b' 
  AND token = 'W9dOpp4Tp8cUnSFIVUzd2Zljg34rWxF/ZvpHNsjDYoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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