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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8264a6d091e939ff0b258a5a5e6c9577d0a254195c02c4253d8f983f4650a6e5' 
  AND token = '4L6ObUCrXQW62AwEcebNRURXIKS2WFy3cRjwIb2H/Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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