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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc52707193d20c61d38d64f46a748cb43dc1239d071498f7981a865dbd68edd4' 
  AND token = 'l2Bn51UOzUo903prSJnwem3oGb6myYL0+u1iJdk5LR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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