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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa32d97f8aa0ff0b13444d3242cdbd930a9a586d0e940020c3adbae846e678ce' 
  AND token = 'bRHZM6SEAjS0SaUS3NNzBV7vEuBlB/vyuNLhrwhY54c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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