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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808798cfb3388424656c2969d467f33147224feb50a8b2a841429f34a03d4ccd' 
  AND token = '08zhu/Rt6Xe4bKs0urVwNSHMvCTz2+VrHQuMUocAqpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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