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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f0cd5ff524a74461419f4cfffcb7fe86a49ce6e9d51973d211e63afce5c3972' 
  AND token = 'uuDHLK52v7UNQS9RroDbr2OZ5mJ6CH1e73HdUVb7sS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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