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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15c139224735600002808d3f1bcf40ab6ae2b66e28da4c26c47261df53bf1c4f' 
  AND token = 's4FdmqKKb76mEzSIgeqcZ+Ns5zbLKRpDHH5paX13eh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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