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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '520dfb0976929c0c4ab7b41adf9faad185b30986e98affb7f531ce439e9f6488' 
  AND token = 'UsoUax9nXKQCH18ocgIXdaMTLYgBN6psahbZ3XjTsqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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