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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d87b4e4db3e468b31b8ae6d95efaea352e197424213fcb5764c695027c37adc' 
  AND token = 'sHo3gfWzpHVgp68LRZei2pIvfTC7ffsMexzDKfKtJq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00302

JSON explain

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