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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7791b8894c2948418c5c114f4ae13b287be7e1199fa0b8be5c7de57830e0c73f' 
  AND token = 'RX/MkVreUSr++2q+p2LuI7sUWBfXQAi4K1uOAsVqagQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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