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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e89110e3ea8f0623dd5669fd0dc912538f76981504b9d52990ef6259ae22a3a' 
  AND token = 'SRmDEBc87ZI+0yxocr4QGwBjImaU0LgK72/M0B6SnMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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