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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9810db6c201b5189ee5424e88695514c91e6e1dec6d195ed4959afbdbf84316' 
  AND token = 'tUX4YhUvRxUP2jFmCIiHhPkSqHCOooc8i1KOBHICJSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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