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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67d313cc632d612829bf216a98c54e35258e071cdaf07d575e08814aa5b240d' 
  AND token = 'PkZPfMxeDSX4IRheHE8tgIxnk8Lp91abnr+lcq1l3g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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