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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '684e88d53d76d62ed136e0cfccc0c3bcb34bccff6400a5373c870b1b503e0f4d' 
  AND token = 'Cm8d7seH0e+ZVtY6craLR1xgAKHaPH630icmWWpdpeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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