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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b923a4b91074827ff19770c85c8cb4cf6e4451b5050f16703fd6adb39f90d65f' 
  AND token = '/RASKY3MaGRtBLtjls7vd6lf70D3AFLui1ken8zfVl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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