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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaf6932fc7bd65b5e8ad0801c5955d2fdec24ac38851dc873b733964cac55624' 
  AND token = 'AJwJpEx/Bnd6ClreVr0OWvKmv9kOON44+vXXfiH0gLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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