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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bf917c76b716afd241498c5af13ff5c534149dd5dfe2268964b3956c10e0690' 
  AND token = '/p+jFdeirFxdcV7xOsRxz19CRemOvjzio+5pa6rGiD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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