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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e76fcca5f748c6d88de055f80630f0008a3a7c41f10483ac371a5d5be8a676f4' 
  AND token = 'wi0uO4m+WKaOyZc0q3Xafh/C2OdmofdWt9qGNcDiz3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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