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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a152a531cd214d35e3c6ae0540ff68fb3fecf743d16b2a7939c1c9258097abd3' 
  AND token = 'vupWWg9I1munRIHAE7N44jIxSjm7zVz6lzi5yCu/gjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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