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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c65f829399f093af3d89f0c8a5c98e60fc8460b614aee95c819f0f2f1fbfced' 
  AND token = '8ooiospJD9IARwfJNWT9U19M3Jrdet+fIaSCTD2yYJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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