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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b40910e714dcc83c1171084cee4b4336d3301d47f80d4b5e72886d5b3fe2831' 
  AND token = 'ydaiEk9aVOkGaEk+u5q9LVU8i1xHkHS534DeN3WLPHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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