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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcab5b8883f50a4d163f21c974a9dc5500b00129ad231d0ce7a5419cb2cb126a' 
  AND token = 'Pylfk9FGuy+qogjz0krcrESukFKJYHDM4upovc3khLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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