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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f3b02a890dbb0d342f002e1717d5aeda92da1d74c04c725ce2258dadd9bc88' 
  AND token = '5cu5gHeKwWIqZ4DpHj3xgA97Gw1tGoQKhi+NT95Ti1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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