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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b9ae13fb739fd3eb265df208fcdb183e2fda9a3d7d2bd2239eb181adf5303b' 
  AND token = 'D1xIhc/8E9tC5Kxs2fH/HLI++nMrrAvZEd0toelc7c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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