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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1e2a79774b5d917dc59c68080aaff32f5af745afabbc86e3b6b8235d7d190ec' 
  AND token = 'NRb+FK9yNckEpm7dt19ZGgQ+x50uepK030xlU66bBVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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