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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '727ba9feb7235fde99bc4a3d260f962670c4bd07acd7fbc44c345fb2c32b959e' 
  AND token = 'n6foUsDEdhk+EpuzRz8iKvviEOJIZdHZ2cM2RF9Hack=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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