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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb6271bd1a26bfb9891d394ba534fc23b4164b8b150a331537e43b01fc426d6' 
  AND token = 'e9OTngSIN04Em8Jl92Wk0oJiqf/uUbpIH9zBrieWy/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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