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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab6e385aeed2648ec66d5d980e9c8b64c17407a37e853f5714b1d32e6c45581' 
  AND token = 'CJ3JExI7O7mDMfwNbHUS/X4Skl+YUEqNFuwtl5HVQ2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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