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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c69a35130b783aae8aefb79bb3673fb943070b954d74b2d018d00909a6c2b633' 
  AND token = 'MQH4QhKmhH+VskCIoMIE02Uu4OjWajRO53e4m8xpfjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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