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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00ebaf4db0370d7a46952fcd095a7974b2636e95feaf247fc2408eb708e9ebcc' 
  AND token = '0JdZ7jvarpDPP3tLXRhzAu2RCkUUYzXOCtRfzq9bNdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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