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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '387b4aacadceb90036bd0e5b7b5b9ac55f31c6594b9d5835b877458e95077814' 
  AND token = 'lGP7XiYooso98rrt7bln5QTJgLsI5DGl8JJbsze5yIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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