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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54570d9e544f232f63340cfcdd4ebd8a22369db9c45f452950f6e0b5e6b1eb6c' 
  AND token = 'BW68nTtUIev4TvLTmqCt65mB3Untoeg/t0aHM+TNwBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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