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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '680de103ac34e2dca140cfc4a5b1d24d4b884c632a6754bb562a23810b333d62' 
  AND token = 'CRQTISz6LTlF9RENFsoISPPkQ3HD/2F7GFoRBc/tG8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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