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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c70f26cd3334620b78131a8ae05a550efa6e04b002c23a604881369da86e3a54' 
  AND token = 'cJlXsQrDbcWNSl62+FM4qh2G+dyVckJo/JaRyF5bH+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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