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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4917d737ee87b665b1a4e179c37d519e8abb60639be252295a52b662164dcc2b' 
  AND token = 'Mf/+qHVhzbD/Uhp2n7AENvc60C7Ik4DDpgopJO+J3R4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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