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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '861491c77e38a52b15f5c806954e7ece88358c88b8ac5c388629d6f2f859ec5b' 
  AND token = '2Yd879sAa9bev2pf3mZEdWJZvD9cHBY4872XzjusQXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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