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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3780d9edc40acb1f0e6620e10c3dd6a6862ddd7ef3ccaea486f1c44fb746db6f' 
  AND token = 'BRzI8Z3poFna80O2aWaVHemOBFoTcaH1egcC3so6w2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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