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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f4f1914240f3e5118b9442a2fb34d0e02d8dbaca9902d00011c4df5951ca538' 
  AND token = '3+4ZPHzGFQcl1uABbPH3mc2jNybULK9mglz7elZUETs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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