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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bccef34bb3bc51fed0242e675f773e3951a91b4caf6adaa445aafc859a95330' 
  AND token = '3Q2g3oF/IzurnaU+wXFKEFBHacn5VWrKh0swxh99o3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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