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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32d69300cfa682c4f583fc4d1c7a913eed8a004f00370c2638da1889d54c28cf' 
  AND token = '3+l9a2SxJzAben3M21SA4jY8M9gm+d/TJVrJI22HjkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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