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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f30604e29347155a02f15fb813d5c7e979a8689921bb287b08cc1224b493e9' 
  AND token = '0qNKWmlDmlIN38YWs0CiZiNu0HDSeJxWLVBEPEqlei4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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