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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb0de7970f256a2da8107be27ff111054657a17cd25c1ee045fe605be861c574' 
  AND token = 'CyyPbjmz6tV+e7F9jLN0v8Ht12416305oUNmoc0oHj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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