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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93dc34c3c8e4fa46bac7ae5bce7ada07f19b39f630fe3c79c64ad84b657f6739' 
  AND token = 'sz0Er7jAHbCu0xc1q5/OeR39JvdWTsCv/rHBCbiKaTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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