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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '017480c1b7408aca6877553ef06f2ed0c218e07b95e1009433f3630dbaa86f93' 
  AND token = '4zxjGZxARTkU8xCGchvCxe7nxDU30RZ8PnD0z0qO4BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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