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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4f53f2e8ee2b537dd35e0d08268d426ed7289c832b38711e15b942d2ac8abba' 
  AND token = 'qeXku/nR7n6alXNu/M205GggiBBO09mPZTsVxHFf1eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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