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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94bee343e475dc56ba22b2d59e10b585944442f4ea3bb63316af2233a3809f8e' 
  AND token = 'Sr1XYhGVczKU1/2ZNhfy4dLhPzHJ9+Idbg34E1s02Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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