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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a576debd0c2ca7ff5a08eb3edb02cbbddf3502d904e0bb881fa719b3c48246c7' 
  AND token = '8idN/evrn5iMCZzp0pl7sRku8QNodaxfI+0RUxtv31Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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