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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3586f3f82e839efcde18f76ecd73ee19ca8d09653149bc06b89217bb40a23ebe' 
  AND token = '0LDOHULoloBkTkTZFnGKpzq6HQXGY132e0i7rrPCA5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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