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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36644dab64a210734251bb4f21e9afe761e09e61bbd1240341368d60b2654536' 
  AND token = '3pk0tWZrGhhP0KWlUx8aHBBZKQeRH4kNz5p4edGprYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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